| /*** |
| * ASM: a very small and fast Java bytecode manipulation framework |
| * Copyright (c) 2000-2011 INRIA, France Telecom |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the name of the copyright holders nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
| * THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| package org.apache.tajo.org.objectweb.asm.util; |
| |
| import java.io.PrintWriter; |
| |
| import org.apache.tajo.org.objectweb.asm.AnnotationVisitor; |
| import org.apache.tajo.org.objectweb.asm.Attribute; |
| import org.apache.tajo.org.objectweb.asm.ClassVisitor; |
| import org.apache.tajo.org.objectweb.asm.FieldVisitor; |
| import org.apache.tajo.org.objectweb.asm.MethodVisitor; |
| import org.apache.tajo.org.objectweb.asm.Opcodes; |
| |
| /** |
| * A {@link org.apache.tajo.org.objectweb.asm.ClassVisitor} that prints the classes it visits with a |
| * {@link Printer}. This class visitor can be used in the middle of a class |
| * visitor chain to trace the class that is visited at a given point in this |
| * chain. This may be useful for debugging purposes. |
| * <p> |
| * The trace printed when visiting the <tt>Hello</tt> class is the following: |
| * <p> |
| * <blockquote> |
| * |
| * <pre> |
| * // class version 49.0 (49) // access flags 0x21 public class Hello { |
| * |
| * // compiled from: Hello.java |
| * |
| * // access flags 0x1 public <init> ()V ALOAD 0 INVOKESPECIAL |
| * java/lang/Object <init> ()V RETURN MAXSTACK = 1 MAXLOCALS = 1 |
| * |
| * // access flags 0x9 public static main ([Ljava/lang/String;)V GETSTATIC |
| * java/lang/System out Ljava/io/PrintStream; LDC "hello" |
| * INVOKEVIRTUAL java/io/PrintStream println (Ljava/lang/String;)V RETURN |
| * MAXSTACK = 2 MAXLOCALS = 1 } |
| * </pre> |
| * |
| * </blockquote> where <tt>Hello</tt> is defined by: |
| * <p> |
| * <blockquote> |
| * |
| * <pre> |
| * public class Hello { |
| * |
| * public static void main(String[] args) { |
| * System.out.println("hello"); |
| * } |
| * } |
| * </pre> |
| * |
| * </blockquote> |
| * |
| * @author Eric Bruneton |
| * @author Eugene Kuleshov |
| */ |
| public final class TraceClassVisitor extends ClassVisitor { |
| |
| /** |
| * The print writer to be used to print the class. May be null. |
| */ |
| private final PrintWriter pw; |
| |
| /** |
| * The object that actually converts visit events into text. |
| */ |
| public final Printer p; |
| |
| /** |
| * Constructs a new {@link TraceClassVisitor}. |
| * |
| * @param pw |
| * the print writer to be used to print the class. |
| */ |
| public TraceClassVisitor(final PrintWriter pw) { |
| this(null, pw); |
| } |
| |
| /** |
| * Constructs a new {@link TraceClassVisitor}. |
| * |
| * @param cv |
| * the {@link ClassVisitor} to which this visitor delegates |
| * calls. May be <tt>null</tt>. |
| * @param pw |
| * the print writer to be used to print the class. |
| */ |
| public TraceClassVisitor(final ClassVisitor cv, final PrintWriter pw) { |
| this(cv, new Textifier(), pw); |
| } |
| |
| /** |
| * Constructs a new {@link TraceClassVisitor}. |
| * |
| * @param cv |
| * the {@link ClassVisitor} to which this visitor delegates |
| * calls. May be <tt>null</tt>. |
| * @param p |
| * the object that actually converts visit events into text. |
| * @param pw |
| * the print writer to be used to print the class. May be null if |
| * you simply want to use the result via |
| * {@link Printer#getText()}, instead of printing it. |
| */ |
| public TraceClassVisitor(final ClassVisitor cv, final Printer p, |
| final PrintWriter pw) { |
| super(Opcodes.ASM4, cv); |
| this.pw = pw; |
| this.p = p; |
| } |
| |
| @Override |
| public void visit(final int version, final int access, final String name, |
| final String signature, final String superName, |
| final String[] interfaces) { |
| p.visit(version, access, name, signature, superName, interfaces); |
| super.visit(version, access, name, signature, superName, interfaces); |
| } |
| |
| @Override |
| public void visitSource(final String file, final String debug) { |
| p.visitSource(file, debug); |
| super.visitSource(file, debug); |
| } |
| |
| @Override |
| public void visitOuterClass(final String owner, final String name, |
| final String desc) { |
| p.visitOuterClass(owner, name, desc); |
| super.visitOuterClass(owner, name, desc); |
| } |
| |
| @Override |
| public AnnotationVisitor visitAnnotation(final String desc, |
| final boolean visible) { |
| Printer p = this.p.visitClassAnnotation(desc, visible); |
| AnnotationVisitor av = cv == null ? null : cv.visitAnnotation(desc, |
| visible); |
| return new TraceAnnotationVisitor(av, p); |
| } |
| |
| @Override |
| public void visitAttribute(final Attribute attr) { |
| p.visitClassAttribute(attr); |
| super.visitAttribute(attr); |
| } |
| |
| @Override |
| public void visitInnerClass(final String name, final String outerName, |
| final String innerName, final int access) { |
| p.visitInnerClass(name, outerName, innerName, access); |
| super.visitInnerClass(name, outerName, innerName, access); |
| } |
| |
| @Override |
| public FieldVisitor visitField(final int access, final String name, |
| final String desc, final String signature, final Object value) { |
| Printer p = this.p.visitField(access, name, desc, signature, value); |
| FieldVisitor fv = cv == null ? null : cv.visitField(access, name, desc, |
| signature, value); |
| return new TraceFieldVisitor(fv, p); |
| } |
| |
| @Override |
| public MethodVisitor visitMethod(final int access, final String name, |
| final String desc, final String signature, final String[] exceptions) { |
| Printer p = this.p.visitMethod(access, name, desc, signature, |
| exceptions); |
| MethodVisitor mv = cv == null ? null : cv.visitMethod(access, name, |
| desc, signature, exceptions); |
| return new TraceMethodVisitor(mv, p); |
| } |
| |
| @Override |
| public void visitEnd() { |
| p.visitClassEnd(); |
| if (pw != null) { |
| p.print(pw); |
| pw.flush(); |
| } |
| super.visitEnd(); |
| } |
| } |